Remove largely useless 'Split to mosaic' and 'Combine mosaic' functions. Possibly retain 'change mosaic tile size' option, but only on MAPALLOC_MOSAIC.
Change GetExt to get only last extension. Add new CompareExt function to handle compound extensions (see bug report).
Fix alpha map generator to include all land types in map (reported by Andrew B. via e-mail, error is 'calc_Alpha_GenMaps error - invalid alpha index in LandTypeAlphaIDBuf').
DM editing doesn't always mark HF as dirty (see this thread.)